Pay off Rental House vs Investing in more now

[Eric Waters]

I'm curious to get the pulse of my fellow real estate investors. I currently have a rental house with a balance of about 37K. My goal is to pay it off free in clear by May. My question is in your opinion, would you pay that off first or use the funds to proceed with investing in an additional property or using it as a down payment for another property. 

My heart tells me to stick w/ the goal of paying it off first before buying another property.

Just want to hear your thoughts and look forward to the discussion.

Thanks